Separating and condensing device for ammonia suction.



Mm. 642120. Patented Jan. 30, I900. G. B. HIETT.

SEPARATING mm cownsmsma DEVICE FOR MMGNIA SUCTION.

(Application filed Feb. 1 .5, 1899.)

2 Shasta-Shnat I.

(We Model.)

Mm. #342,320. WWW m. m, mm a. a. MEEW.

$EPMRM'HMG MM EDNDENSING DEWBE FUR MMHMMM SUBTWW.

(Application filed Feb. 15, 1899-) (W10 Wmdel.)

. arrest STATES PATENT GEORGE E. lllETT, OF ATLANTA, GEORGIA, ASSIGNOROF ONEJIALF TO SAMUEL L. BREIVER, OF TUSKEGEE, ALABAMA.

SEPARATING AND CONDENSING DEVlCE FOR AMMONIA SUCTION.

SPECIFICATION forming part of Letters Patent No. 642,120, dated January30, 1900.

Application filed February 15, 1899, Serial No. 705,544. (No model.)

To all whom it may concern: the liquid portion of which expands and ab-Be it known that LGEORGE B. HIET'I, a citisorbs the heat developed. zenof the United States, residing at Atlanta, In both types of machines thecompressors in the county of Fulton and State of Georgia, are invariablydriven by direct mechanical 5 have invented certain new and usefulImconnections from acrankshaft,andowing to provementsinSeparatingandCondensingDethe fact that the piston makes a complete vicesfor Ammonia-Suction Pipes; and I do stroke at each half-revolution ofthe crankhereby declare the followingto be a full, clear, shaft greatcare is taken to prevent gorging and exact description of the invention,such or flooding of the cylinder with liquid, for the 10 as will enableothers skilled in the art to which reason that knockingoutof thecylinder-head it appertains to make and use the same. or breaking of theweaker parts of the pump This invention relates to improvements in isapt to occur,as the piston travels faster thanice-makingandrefrigeratingmachines of that the liquid can be expelled.In dry-gas maclass employing as a refrigerating agent a chines whereinthe pumps are built for very 15 volatile liquid, such as anhydrousammonia, high speed and to handle gas only everypreliquefiableundermechanicalcompression,the caution is taken to preventthe inlet of an unexpansion of the liquid and consequent abdue amount ofliquid to the cylinder, the sorption ofhcat thereby being utilizedforcold pumps being elevated in some instances to a production. Machinesof this character opconsiderable height above the plane of the re- 2oerate under two systemsnamely, the dry frigerator. Humid-gas machinesare generor hot gas system and the cold or hually run at a lower rate ofspeed than drymid gas system. In the dry-gas system the gas machines,but are designed to handle a greater portion of ammonia enteringtheconrcertain proportion of gas and liquid only, and .pressor-cylinder isgaseous and the temperagreat care is also taken therein to prevent 25 ture becomes bycompression several hundred the admission o'fam monia tothe compressor degrees greater than the boiling-point, due cylinders ina complete liquid state. to condenser-pressure, resulting in the su Inboth systems where the refrigeratingpet-heating of the gas andconsequent loss of coils are arranged in or above the plane of motivepower, so that difficulty is often found the pumps the suction-pipes areextended 8o 0 in cooling the gas in the condenser and a waup from thebottom headers of the coils and (er-jacket is required to keep thecylinder then back overhead to the pumps to prevent cool enough toprevent injury to the packing the flow of a slugor solid mass of matterand other vulnerable parts, whereby the macomposed of liquid ammonia,oil, foul gas chine is encumbered and the cost of manuand air, scale,and other residuum, or the 5 facturing and operating the same increased.rush of liquid ammonia alone to the pumps. In the cold or humid systemof compression The effect of the elevation of the suction-pipe thoseobjections are to a great extent overis to cause the retention in thelower headers come, as some of the ammonia entering the of the liquidammonia condensing in the compressor-0y]inder is liquid, so that alargecoils, together with the waste oil, scale, and 0 4o amount of the heatdeveloped is absorbed by other foreign substances, which are carried theliquid which expands into a vapor, and along with the ammonia. Theseliquids and the temperature of the ammonia is thereby solid foreignsubstances accumulate in the confined to a relatively low point and lesswaheaders and back up into the refrigerating- I ter on the condenser isrequired to cool the coils until the pressure of the incoming gas is 5 5same than in dry-gas machines. This is acsufficient to expel them, whenthey are scatcomplished by letting an excess amount of tered and blownout into the suction-pipe in liquid ammonia into the refrigerating orexthe form of a mist or spray after the manner pansion coils, so thatexpansion will ensue of an air-lift in wells. By this means thethroughout the entire length of suction-pipe passage of any large bodiesof liquids and I00 50 to the cylinder, whereby the ammonia enters solidsinto the suction-pipe is avoided under the cylinder in the form of asaturated gas, ordinary conditions, although at all times a small amountof liquid is avoidably carried along by the expanding gas to the pumps.This result is, however, secured at the expense of a material loss inthe refrigerating effect, owing to the obstruction of the coils andresistance opposed to the free flow and expansion of the enteringammonia by the liquids and residuum, to the partial absorption ofammonia by said liquids and residuum, and to the presence of oil andother poor conductors of heat carried through the system. Moreover, theaccumulation of oil at this point is an additional source of trouble,since it becomes easily stiffened when stagnant by contact with theexpandinggases and adheres to the coils, so that it can only be removedby blowing out the pipes with steam or hot gases. Notwithstanding theelevation of the pumps and suction-pipes and the use of variousagitating devices, however, flooding or gorging of the pump-cylinderscannot be avoided when a large number of expansion-coils with a singleammonia feed are employed, for the reason that the circulation is freerthrough the inner or shorter coils than through the outer or longercoils, so that while the pressure of the ammonia-gas in the short coilsis sufficient to keep the same clear of obstructing substances thecorrespondingly-decreasing pressure of the gas in the longer coils isnot always sufficient to prevent the liquids and foreign substances fromaccumulating therein until the flow of gas is nearly if not completelyarrested. This mass of matter being too heavy for the gas to blowthrough it remains until the pressure of the gas is sufficient to liftit out in a body into the suction-pipe, through which it is quicklyforced by the expanding gas behind it to the pumps. In this caseknocking out of a cylinder-head or breaking of the crank-shaft isunavoidable. Owing to the obstruction to the flow and expansion of thegas through the coils above pointed out difficulty has also been foundin getting the return gas to the pumps in machines acting on the cold orhumid system of compression, particularly when the refrigerator islocated at some dis tance from the pumps, and this is a vital objection,since the expansion of the gas is depended upon solely to keep thecylinders cool. At such times it is necessary to cool the cylinders byartificial means, as by packing ice in a box or casing inclosingthecylinder, to prevent serious injury to the mil nerable parts untilthe return gas is received.

The object of this invention-is to provide a separating and condensingdevice for attachment to the suction-pipes of both dry and humid gasmachines, whereby the compressor will be kept cool at all times withoutthe use of water-jackets and oil seals and Without the necessity ofrushing the ammonia through the refrigerating-coils thereto, theentering ammonia, if in a gaseous state, cooled and reduced in volume,so that a larger amount of ammonia will be compressed at eachworkingstroke of the piston and all large bodies of liquids scatteredand the volatile elements thereof converted into vapor before enteringthe compressor-cylinder to prevent injury thereto.

A further object of the invention is to provide a device such asdescribed, which will permit of the suction-pipe being connecteddirectly to the bottom header of the coils, so that all liquids andforeign substances will be quickly conducted therefrom and theobjections heretofore pointed out to the elevation of the pipe avoided.

WVit-h these and other minor objects in View the invention consists ofthe features of construction and combination of parts which will behereinafter more fully described, and particularly pointed out in theannexed claims, reference being had to the accompanying drawings,forming a partof this specification, and in which Figure 1 is anelevational view of the refrigerator, compressor, and connecting pipesof a refrigerating and ice-making machine, showing the application ofthe invention to the suction-pipe thereof. Fig. 2 isa verticallongitudinal section of the invention on an enlarged scale. Fig. 3 is ahorizontal section thereof on line 3 3 of Fig. 2. Fig. 4 is a verticallongitudinal section of a modified form of device adapted forapplication to suctionpipes extending horizontally to the compressor.Fig. 5 is a vertical longitudinal section of the valve. Fig. 6 isacross-section of the same on line 6 6 of Fig. 5. Fig. 7 is a detailperspective viewof the rotary feed plate or disk. Fig. 8 is a detailsectional view of a portion of the valve stem and disk.

Referring now more particularly to the drawings, wherein like letters ofreference designate corresponding parts throughout the several views, Arepresents the compressionpump; B, the refrigerator, shown in thepresent instance in the form of a freezing-tank arranged above the pumpand containing a series of expansion-coils 0, connected at top andbottom by manifolds or headers D and D; e, the liquid-ammonia-supplypipe leading directly from a condenser or from a liquid-ammoniareceptacle (not shown) to the header D, and f, the suction-pipe throughwhich the ammonia flows from the coils to the pump. These parts maybeconstructed and arranged in any of the well-known ways for ice-makingand refrigerating purposes as carried out under the brine system ordirect-expansion system.

In carrying my invention into practice for application to suction-pipesextending vertically at their point of connection to thecompression-pump I employ a case or chamber G, which is inserted in theline of the suction- 'pipe adjacent to the pump and is open at bothcasing G to the exterior.

liquid tight joint. The flange at the upper end of the casing iscountersunk to receive the fiange on the upper end of an inlet-tube H,which lies flush therewith, so that the packing ring or gasket appliedbetween the said upper flange of the casing and suctionpipe will alsoserve to prevent any escape of gas between the tube and casing, and thistube is removably fitted in the inlet-opening of the casing and projectsdownwardly into the separating and condensing chamber G formed thereby.Extending upwardly from the bottom portion of the chamber in line withthe discharge opening J at the lower end thereof is an annular shield ordeflector K, which is of relatively greater diameter than theinlet-tube, but of correspondingly smaller diameter than the casing, sothat the chamber G will be of sufficient area to allow for the free flowand circulation of the ammoniacal gases and liquids passingtherethrough. This shield or deflector is provided with a partition ordiaphragm 70, forming the bottom of a cup-shaped pocket or trap Z, whichsurrounds the lower extremity of the inlet-tube and a series of ports orpassages m below said pocket and communicating with thedischarge-opening. It will thus be seen that the inlet-tube and pocketor trap together form an interior chamber, which is in com municationwith the expansion-chamber G through the annular space, port, or passageformed at the meeting ends of said parts by making the trap of greaterdiameter than the tube. In this trap, which constitutes the base orlower end of the interior chamber, is inclosed a sprayer or injector nin the form of a ring having a plurality of perforations orfeed-orifices arranged immediately below the inlettube and incommunication with a pipe n, projecting through the walls of the pocketand This pipe serves as the delivery end of a liquid-ammoniasupply pipe0, tapped into the pipe 6, leading from the condenser, whereby theammonia is conveyed to the sprayer, and thereby divided up and injectedinto the condensing-chamber in a plurality of streams to saturate andcool, and thus diminish the volume of the dry gases entering through theinletpipe, and the sprayer serves also as an auxiliary deflectingsurfaceacting in conjunction with the annular deflector to break up and scatterany liquids passing through the suction-pipe and cause the expansion ofthe liquid ammonia mingled therewith into vapor, in the mannerhereinafter described. 13y injecting the an1- monia into the casing inthis manner a thorough and effectual saturation of the entering gasestakes place, as the entire amount injected is placed in condition toquickly en pand and absorb the heat and intimately combine with thegases.

The feed of ammonia to the separating and condensing chamber may beregulated by an expansion-valve of ordinary construction, if desired;but 1 preferably employ the form of valve shown in the drawings, whichhas been devised especially for use in connection with the device inorder that the feed of ammonia thereto may be controlled with certaintyand a proper proportion injected according to the density of the gaspassing from the expansion-coils to the pump, which may be determined bythe presence or absence of frost on the cond enser-casin g. This valvedevice may vary in details of construction, but as illustrated comprisesa casing P, suitably connected to the chamber G and to the proximal endsof the pipes e and 0 and having inlet and discharge passages p and p,which are respectively in direct communication with said pipes. Thesepassages are separated by a partition (1, chambered at or about itscenter to form two independent seats 0* and r, the former having a port8 and the latter a port 8. The port 8 is controlled by a plug-valve t,which projects through an opening in the wall 0* and is mounted to slideand turn freely therein, and projecting from the opposite ends of thisvalve are stems it and it, extending to the exterior throughstuffing-boxes o and o in the front and back walls of the casing. On thestem it are male threads M, which engage with corresponding femalethreads in the gland of the stuffing-box v", and. fitted upon the outersquared end of said stem is a worm-wheel 10, with which engages awormshaft to, provided with a hand-wheel 10 by which the stem may beturned to move the valve in or out, and thus close or open the port, thescrew-threads being of proper length and pitch to allow the valve tohave one complete revolution and at the same time sufficientlongitudinal movement to open wide the portwhen it is desired to allowthe liquid ammonia to feed quickly and freely to the separating andcondensing chamber. Supported by arms projecting from the front of thevalve-casing is a dial-casing X, the face of which bears a series ofnumerals ranging in the presentinstance from O to 16. The hand orpointer m of this dial is formed with a socket m, which is preferablysquare in cross-section and is secured in position by a collar :0 andfitted in said socket is the square extremity a of the valve-stem 21,whereby the hand or pointer is mounted to turn with the valve. Thesquared end of the stem is free to slide in the socketto accommodate forthe longitudinal movement of the valve, but posi tively connects thevalve and pointer, so that the latter will be turned to indicate theextent of axial movement of the valve. The port 5 in the valve-wall r iscontrolled by a rotary feed plate or disk ;I mounted on the rear end ofthe valve tand provided with a series of graduated openings y,corresponding in number to the figures on the dial, and this plate has aclutch connection with the plug-valve,which permits the latter to haveindependent longitudinal movement while causing both to turn in unison,said clutch connection being constructed as follows: The plate isprovided on its outer face with a hub or sleeve 2, slotted atdiametrically opposite sides for passage of the ends of a pin 2 passedthrough the valve, and is held firmly pressed against the said seat 1'by a spiral spring 2 encompassing the valve between the disk and a fixedcollar 2 formed on the outer end of said valve. By this construction thefeed-plate is caused to turn with the plug-valve by the pin bearingagainst the slotted hub thereof, while the pin is adapted to slidefreely in the slots to compensate for thelongitudinal movement of saidvalve. From the foregoing description it will be readily seen that whenthe hand-wheel is turned to rotate the feed-disk to bring either one ofits openings into coincidence with the port 8 the plug-valve will bemoved longitudinally to the proper extent to proportionately regulatethe size of the port 8, and that by employing a feed-plate of theconstruction set forth the feed of liquid ammonia to the spraying-ringmay be regulated as desired, according to the state of the gas passingthrough the suction-pipe and the amount of liquid ammonia required forsaturation. The object in employing the plug-valve is to prevent theinlet of any ammonia which may leak past the feed-plate, and therebyavoid the feed of an excess amount, which would be objectionable atperiods when the gas is passing through the suction pipe in a liquid ordensely-saturated state. When it is desired to feed through anyparticular opening in the feedplate, it is simply necessary to turn thehandwheel until the hand or pointer registers with the correspondingnumber on the dial-face, whereupon the opening will be brought intocoincidence with the port s,an d by this means the amount of liquidammonia being-sprayed into the separating and condensing chamber may beascertained at any time.

In Fig. 4 I have shown the separating and condensing device adapted forapplication to suction pipes extending horizontally to thecompression-pump. In this construction the inlet pipe or tube H isformed integrally with the casing and projects vertically down into thelower portion of the chamber G, which is formed by a depending annularwall G ,closed at bottom by a plate or head K This head takes the placeof the partition or diaphragm shown in the vertical condenser and servesas the bottom of the pocket or trap Z, which is formed by an integralannular wall K, rising from said head and inclosing the lower extremityof the inlet-pipe. casing in this instance may be hadby simply detachingthe head and pipe n.

In practice the liquid ammonia fed to the spraying-ring is injected intothe pocket or trap, condensing-chamber, and lower portion of the inlettube or pipe in the form of a mist or spray which expands and circulatestherein and then passes out through the dischargeopening to the cylinderof the compressor, where its expansive property is utilized to absorbthe heat developed, and thereby keep Access to the 1 the cylinder,piston, and component parts of the compressor cool. This operation iscontinued during the entire action of the compressor, and the result isthat the compressor is maintained at a low temperature, whether anyreturn gas is being received or not, the use of water-jackets, oilseals, and other foreign lubricating and cooling agents avoided, andexcessive superheating of the ammonia during the period of compressionprevented. When the ammonia passing through the suc tion pipe on its wayfrom the expansion-coils to the compressor is in a gaseous or vaporousstate, it is checked by the annular deflector and caused to circulatethroughout the condensing-chamber, so thatit will be thoroughlycommingled with the atomized liquid ammonia preliminary to its entranceinto the cylinder. On coming in contact with the dry gas the liquidammonia expands and absorbs the heat and reduces the volume thereof, andthis expanding and absorbing action continues during the flow of the gasfrom the condensing-chamber into the compressor-cylinder, whereby thegas enters said cylinder in a saturated state and drenches thesuction-valves, cylinder-walls, piston, and piston-rods and takes up theheat developed in the most effective manner. All liquid bodies flowing.through the suction-pipe dash forcibly against the spraying-ring andpartition or diaphragm of the deflector and are thereby scattered andbroken up, the violent agitation set up by the contact of the liquidswith the deflector and the sloshing action of the same against theinlet-pipe and walls of the condensingchamber, as well as the suctionaction of the piston, causing the'conversion of any liquid ammonia whichmay be contained therein into vapor. This vapor passes out into thecompressor-cylinder, while the non-volatile elementssuch as oil, scale,and other foreign substances-fall back intothe trap or cup or down tothe bottom portion of the condensin g-cham her, where they remain untilthe liquid particles reach the level of the sprayingring anddischarge-ports, when they are gradually blown out by the atomizedliquid ammonia and entering gas. The solid particles which are not blownout may be removed whenever desired by detaching the inlet tube or pipein the construction shown in Figs. 1 to 3 and the bottom plate anddelivery portion of the ammonia-supply pipe in the constructionshown inFig. 4. By this means the passage of any bodies of liquids into thecompressor-cylinder sufficiently large to cause injury to the compressoris prevented, and I am thereby enabled to connect the inlet end of thesuction-pipe directly to the bottom header D of the expansion-coils, asshown at f in Fig. 1, instead of elevating the pipe in the usual manner,as indicated at f in broken lines in said figure, to avoid theobjections to the elevation of the pipe hereinbefore set forth. Byconnecting the suction-pipe directly with said bottom header alsochoking of the separating and condensing chamber cannot occur, as, owingto the fact that the liquids flow out of the header as fast as they arereceived from the coils, only a small quantity passes through thecondensing-chamber at a time.

I am aware that it has heretofore been proposed to employ an injectorfor spraying liquid ammonia directly into the cylinder or gas-chamber ofthe compressor for the purpose of cooling the same; but it has beenfound in practice that this has no beneficial effect and results only ina loss of the refrigerating agent, since the ammonia is expelled by therapid action of the piston before full expansion and absorption of heatand any material reduction in temperature take place.

' llloreover, the injection of ammonia directly into the cylinder wouldbe of no advantage in cooling the suction-valves in the heads ofdouble-acting compressors acting on the cold or humid system ofcompression nor in reducing the volume of the entering gas incompressors acting on the dry or hot system of compression. My inventionprovides, on the contrary, a simple and effective form of device whichserves the dual function of injecting a cooling agent where a thoroughsaturation and reduction in volume of the dry gas takes place before itenters the cylinder and the full expansive property of the ammonia thenutilized for cooling the cylinder and of breaking up and scattering alllarge bodies of liquids, so that the suction-pipe may be connecteddirectly with the bottom header of the expansion-coils and injury to thecylinder and obstruction of said coils prevented.

It will be understood that the invention is not limited to the exactfeatures of construction and arrangement set forth as constitut ing itspreferred form, but that these maybe modified in certain respects ascircumstances or the judgment of those skilled in the art may dictatewithout departing from the essential features of the invention.

I do not in this application claim the process of cooling the cylindersof compressors for refrigerating apparatus as herein disclosed, as suchprocess is an independent invention and forms the subject of a separateapplication, Serial No. 738,875, filed by me on December 1, 1899, inaccordance with the requirements of the rules of practice now in force.

Having thus described the invention, What is claimed as new is-- 1. Inan ice-making or refrigerating apparatus, the combination, with acompressor-cylinder and its suction-pipe, of a casing connected withsaid pipe and having inlet and discharge ports, an expansion chamber incommunication with the discharge-port, an interior chamber incommunication with the inlet-port and expansion-chamber, an in jeetingdevice located in said interior chamber, and a supply-pipe independentof or auxiliary to the suction-pipe, for conveying a volatile liquid tosaid injecting device.

2. In an ice-makin g or refrigerating apparatus, the combination, with acompressor-cylinder and its suction-pipe, of a casing arranged in saidpipe and having a deflector located between its inletand dischargeports, an inlet pipe or tube leading from the inlet end of the casing tosaid deflector, an injecting device located in proximity to the meetingends of the deflector and pipe, a supplypipe leading through the wall ofthe casing to said injecting device, and a valve in the supply-pipe.

3. In an ice-making or refrigerating apparatus, the combination, with acompressor-cylinder and its suction-pipe, of a casing arranged in saidpipe and having a deflector projecting from its discharge end and havingports in communication therewith, and a pendent tube removably fitted inthe inlet end of the casing and leading to said deflector.

4. In an icemaking or refrigerating apparatus, the combination, with acompressor and its suction-pipe, of a casing arranged in said pipe andhaving an expansion-chamber, a deflector forming a pocket or trap, andan inlettube leading into said trap.

5. In an ice-making or refrigerating appara tus, the combination, with acompressor and its suction-pipe, of a casing arranged in said pipe, saidcasing having a deflector forming a pocket or trap and an inlet-tubeleading to the trap, one of said parts being removable for access to thecasing.

G. In an ice-making or refrigerating apparatus, the combination, with acompressor and its suction-pipe, of a casing arranged in said pipe andhaving a deflector and an inlet-tube leading thereto, said deflector andtube being of relatively smaller diameter than the casing to form anintermediate expansion-chamber.

7. In an ice-making or refrigerating apparatus, the combination, with acompressor and its suction-pipe, of a casing removably applied in saidpipe and provided with a deflector and a removable inlet-tube leadingthereto.

8. In an ice-making or refrigerating apparatus, the combination, with acompressor and its suction-pipe,of a casing having an interior annulardeflector rising from its discharge end and having a diaphragm forming acup-like trap or pocket and discharge-ports below said diaphragm, and apendent inlet-pipe projecting down into the mouth of the pocket, saiddeflector and tube being of relativelyless diameter than the casing andforming an intermediate expansion-chamber.

9. In an ice-making or refrigerating apparatus, the combination, with acompressor and its suction-pipe, of a casing arranged in said pipe andhaving a deflector, a sprayer supported by the deflector, and aninlet-pipe for conducting the entering gases and liquids directly tosaid deflector and sprayer before entering the body of the chamber.

10. In anice-makingorrefrigeratingapparatus, the combination, with acompressor-cylinder and its suction-pipe, of a casing applied in thepipe and having a deflector arranged to form a pocket or trap locatedbetween its inlet and discharge ports, a pendent inlet pipe or tubeextending from the inlet end of the easing into the mouth of saidpocket, a spraying device arranged in the pocket,a supply-pipe leadingthrough the Wall of the easing to said spraying device, and a valve inthe supply-pipe.

11. In a refrigerating or ice making apparatus, the combination, with acompressor-cylinder and its suction-pipe, of a device for injecting avolatile liquid, such as anhydrous ammonia, into said pipe, asupply-pipe leading to the injecting device, and a valve arranged in thesupply-pipe and comprising a casing having inlet and discharge passagesseparated by a partition provided with a port,

a rotary disk having a plurality of feed-openings either one of which isadapted to be brought into coincidence with the port by turning thedisk, and means for operating the disk from the exterior of the casing.

12. In a refrigerating orice-making apparatus, the combination, with acompressor-cylinder and its suction-pipe, of a device for injecting avolatile liquid, such as anhydrous ammonia, into said pipe, asupply-pipe leading to the injecting device, and a valve arranged in thesupply-pipe and comprising a casing having inlet and discharge passagesseparated by a partition provided with a port, a rotary disk having aplurality of feed-openings either one of which is adapted to be broughtinto coincidence with the port by turning the disk, a dial having a handor pointer operatively connected with the disk, and means for turningthe disk from the exterior of the casing.

l3. Inarefrigeratingorice-makingapparatus, the combination, with acompressor-cylinder and its suction-pipe, of a device for injecting avolatile liquid, such as anhydrous ammonia, into said pipe, asupply-pipe leading to the injecting device, and a Valve arranged in thesupply-pipe and comprising a casing having inlet and discharge passagesseparated by a partition provided with duplicate seats each having aport, a plug-valve controlling the port in the seat on the dischargeside, a rotary feed-disk mounted on the plug-valve and provided with aplurality of graduated feed-openings either one of which is adapted tobe brought into coincidence with the port in the seat on the inlet side,and means for operating the plug-valve from the exterior of the casing.

14. Inarefrigeratingorice-making apparatus, the combination, with acompressorcylinder and its suction-pipe, of a device for injecting avolatile liquid, such as anhydrous ammonia, into said pipe, asupply-pipe leading to the injecting device, and a valvearranged in thesupply-pipe and comprising a casing having inlet and discharge passagesseparated by a partition provided with duplicate seats each having aport, a plug-valve controlling the port in the seat on the dischargeside and having a threaded stem working in a threaded opening in thecase, a rotary feed-disk mounted on the plug-valve and provided with aplurality of graduated feed-openings either one of which is adapted tobe brought into coincidence with the port in the seat on the inlet side,and a slotted hub or .collar, a pin on the valve having its ends workingin the slots in the collar, a spring for pressing the disk against itsseat, and means for operating the plug-valve from the exterior of thecasing.

15. In a refrigerating orice-making apparatus, the combination, with acompressor-cylinder and its suction-pipe, of a device for injecting avolatile liquid, such as anhydrous ammonia, into said pipe, asupply-pipe leading to the injecting device, and a valve arranged in thesupply-pipe and comprising a casing having inlet and discharge passagesseparated by a partition provided with duplicate seats each having aport, a plug-valve controlling the port in the seat on the dischargeside and having oppositely-projecting stems extending to the exterior,one of said stems being threaded to work in a threaded opening in thecase, a rotary feed disk mounted on the plug-valve and provided with aplurality of graduated feed-openings either one of which is adapted tobe brought into coincidence with the port in the seat on the inlet side,operating means connected with the threaded stem of the plug-valve, anda dial having a hand or pointer connected with the other stem of saidvalve.

16. In a refrigerating or ice-m akin g apparatus, the combination, witha compressor-cylinder and its suction-pipe, of a device for injectingavolatile liquid into said pipe, a supply pipe leading to the injectingdevice, and a valve arranged in the supply-pipe and comprising a casinghaving inlet and discharge passages separated by a partition providedwith duplicate seats each having a port, a plug-valve controlling theport in the seat on the discharge side, a rotary feed-disk mounted onthe plug-valve and provided with graduated feed-openings either one ofwhich is adapted to be brought into coincidence with the port in theseat on the inlet side, a clutch connection between the plug-valve anddisk adapted to permit the former to have independent longitudinalmovement but cause both to turn in unison, and means for operating theplug-valve from the exterior of the casing.

17. In a refrigerating or ice-making machine, the combination, with avolatile-liquid-supply pipe, of a feed-valve arranged in said pipe andcomprising a casing having inlet and discharge passages separated by achambered partition having duplicate ports in communication respectivelywith said chain her and inlet and discharge passages, and valvesgoverning the ports, the valve controlling the port on the inlet sidehaving graduated feed-openings either one of which is adapted to bebrought into coincidence with said inlet-port.

1S. In an ice-making or refrigerating apparatus, the combination, with acompressor and its suction-pipe, of a casing arranged in said pipe, saidcasing having a deflector and an inlet leading thereto, one of saidparts being removable for access to the casing.

19. In a refrigerating or ice-making apparatus, the combination, with acompressor, expansion coils, and a suction pipe leading from theexpansiorrcoils to the suction-port of the compressor, of a device forinjecting a volatile liquid into said pipe, and a valve governing thesupply of liquid to the injecting device and having a plurality ofgraduated feed-openings, whereby the feed of the volatile liquid to saidinjecting device maybe controlled in definite proportions according tothe state of density of the gas or vapor passing through the pipe.

20. In arefrigerating or ice makingapparatns, the combination, with acompressor, expansioircoils, and a suction-pipe leading from theexpansioncoils to the suction-port of the compressor, of a device forinjecting a volatile liquid into said pipe, and a valve governing thesupply of liquid to said device and having a plurality of feed-openings,a dial, and a pointer turning therewith and traversing the dial. w

21. Inarefrigeratingorioeanakingapparatus, the combination with acompressor, expansion'coils, and a suction-pipe leading from the coilsto the compressor, of a device for injecting a volatile liquid into saidpipe, and a valve governing the supply of liquid to the injecting deviceand having a plurality of graduated feed-openings, and means forindicating when the desired opening is brought into feed ing position.

22. In a refrigerating orice-making apparatus, the combination, with avolatile-liquidsupply pipe, of a feed-valve therein having a pluralityof graduated feed openings, and means for indicating when the desiredopening is brought into feeding position.

In an ice-making or refrigerating apparatus, the combination, with avolatile-liquidsupply pipe, of a feed-valve therein comprisin g a casing having inlet and discharge passages separated by a chambered partitionhaving duplicate ports in communication respectively with said chamberand inlet and discharge passages, a plug-valve controlling the port inthe seat on the discharge side, a rotary feed-disk controlling the portin the seat on the inlet side and having a plurality of graduatedfeed-openings, means for operating said valve and disk, and means for indicating the extent of movement of the disk to bring either one of itsopenings into register with said inlet-port.

24:. In a refrigerating or ice-making apparatus, the combination, with acompressor-cylinder and its suction-pipe, of a casing removably appliedin said pipe and having a deflector and an expansion-chamber incommunication with its discharge-port through ports in the deflector, aninjecting device located at or near the top of said deflector and insaid expansion chamber, a supply pipe leading through the wall of thecasing to the injecting device, and a valve in said supply pipe.

In testimony whereof I afiix my signature in presence of two witnesses.

GEORGE B. I-IIETT.

